I don't know the answer I'm afraid, but it might be worth keeping an eye on the Bodmin & Wenford Railway as they have a diesel gala day this Sunday, so this loco might have been on it's way there. Alternatively, it could have been a loco returning to it's home railway, which of course could be any of those which you listed!
By the way, do you have any more details on the loco you saw - colour, size (ie. small shunter or a larger main line loco) or even class if you were able to tell from the opposite carriageway at 70mph!
Anyway, hope you find out the identity of the mystrey loco.
Tony
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